♪ ♪ moving our economy for 160 years. bnsf, the engine that connects us. >> and by the alfred p. sloan foundation. supporting science, technology, and improved economic performance and financial literacy in the 21st century. >> and with the ongoing support of these institutions and foundations. and... >> this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> suarez: there may be hope yet for bringing the national epidemic of obesity under control. at least, the latest numbers on calories and fast food, released today, indicated possible progress. for years, health officials have warned about americans' growing girth. now, research from the centers for disease control and prevention suggests the fight against fat may be having an effect. among the findings: american children consumed fewer calories in 2010 than a decade before-- 7% less for boys and 4% less for girls. and for adults, fast food accounted for just over 11% of the calories consumed in 2010, down from nearly 13% in 2006.